Protective device.



PRQTEGTIVE DEVICE.

Patented Dec.29,1914.

W. L. COOK & G. W. RODORMER.

\ APPLIOATIDN PILHD 0012s, 191s.

ZQZZZBSS; r l W gay! 0M George Hodormer. n f5 dt/ 'UNITED sTATns PATENT onirica- ...t WALLACE L. Coon AND GEORGE Watchoamnn, or CHICAGO, ILLINQIS.

rnorncrivnnnvrcn.

Specication of Letters Patent.

Patented neces, i914..

Application tiled October 23; 1913. Serial No. 798,778.

To all 'whom it may concern Be it known that we, W"LLA cn L. Coon and GEORGE W. Rononiinn, citizens of the,

United States, residing at Chicago, in the county of Cook and State of Illinois, have inventeda certainnew and useful Improvement. in Protective Devices, of which the follovving'is a full, clear, concise, and exact description. reference being had to the a'ccompanying drawings, forming a part of this specification.

Our invention relates to .protective devices.,

and liasfor its object the provision of an l improved device of this character which "room:

combines in a simple structure a 'lightning arrester and apair of'fuse elements to be used preferably in connection-with low current systems.

Ouv-invention contemplates the provision of a very simple structure for readily removing and inserting fuse elements and also an improved Alightning arrester constructed so that the parts aremounted closely together to 'occupy a min'nnum amount of We fwill explain one formy of carrying out our invention more in detail by referring to the accompanying drawing in which: l

Figure 1 is a top "view of a protective de;- viceconstructed in accordance with our invention; Fig. 2is a sectional View on line a-a vof Fig. 1 Fig. 3 is a sectional View on line'b-b of Fig. 1, and Fig. 4 is a detail perspective view of one of the mounting spri'i'igs.-

In the illustration we show an insulating basel preferably made of porcelain or siming 9 formed partly b ilar material which carries the mounting devices both for the lightning arrester and the fuseielements. Two fuse elements 2 and-3 'are provided which are held between springs 4 and 5. respectively. The springv is shown more" in detail in Fig'. 4 where it is shown as being provided with a longitudinal slit 6, and an 'enlarged portion 7 of this slit is near the upper extremity.- The fuse elements are each provided `with projecting fingers 8, 8 at their opposite extremities and ythe thickness of these 'ngers is such that they will be readily accommodated within the enlargement 7 but in reaching the position Within this enlargement the two tiiies lof the spring 5 must be bent apart as is readily apparent. The spring 4 has an openy punc ling therefrom fan extending projection 1.0 as shown more clearly in Fi s. 1, 2 and 3. This extension l 10 is provide with a notch 1l so" as to more thoroughly confine the rounded extrem-ity 8 Aof afuse element.' `The v'arr angement is such that'vvhen the 'fuse elen'ient 3, for iiistance, is to'be inserted, a projection 8 is firstinserted into the o ening 9 and there after this fuse element is bent downwardly so that its opposite extreinit 8 islodged within the recess 7. In thus ending down against the projection 1`O and the siring action of this projection tends to rmly hold the fuse element in place-'between the v v springs 4 and 5. It will be readily seen that `,different Vlengths of fuse elements' are kreadvily accommodated.

are suitably vheld in' place by screws 12 and 13. Grooves 14, 14 are prefer-abi within the base 1 to confine [and etl `this fuse element .to its -linal resting position, the first mentioned extremity 8 presses The springs 4 and 5 provided v .alinethe springs therein and to thus assist in' assembling.

The lightning arrester portion df our im-y rfproved device consists of a carbon"v block 15 suitably held in place Iby the boltsY 16. Be-

tween this b'lock andthe base 1 aconductingV platel is provided carrying a"y connectorV "18. vA groove`19 provided in the alines4 these parts of the carbon' block. It will be 17 may be readily seen that theconductor .reversed so that the .connector 18,m'ay occupy a position 'appoximately .f Lover the opening 20, if desire .Adjacent'i to this saY carbon block 'two serrated 'conduct-ing' elements 21, 21 are mounted and heldin place by bolts 22. These conducting elements through the agency of the .conducting plate 23 are. in contact with the bolts 12 'so that the conducting plates 21 are connectedrespectively to the two sides of the metallic -circuit to be protected. 'Ijheincoming Vwires of the circuit to be protected may. of course character described comprising an insulating base, a pair of tubular fuse elementsmounted side by side upon said base., a pair of mounting springs for each fuse element secured to said base, a conducting plate mounted upon said base centrally'oi" said fuse elements', a carbon block secured to the top of said conducting plate, a pair of serrated conducting e1ements-mounted upon said base on opposite sides of said carbon block having Aan air gap between said elements and said block, andl conducting elements respectively eX- `tendingfirom said serrated elements to one oea'ch pair of mounting springs.

device oi' the character ydescribed ,comprising an insulating base provided with fl'a'pair 'of grooves,`a pair of tubular fuse elements' mounted side byside upon said' base, a--pairof mounting springs for each :tuse

element secured to said base, each pair of sp'rii'igsbeing accommodated within one of,

thezgiooves' aioresaid, a vconducting` plate ling springs.

mounted upon `saidbase centrally of said fuse'element,I a carbonhlock secured to the to'p'f'fof said `conducting plate, a pair of ser' ratedijconducti'ng elements mounted upon said 'base on oppositejsideso said. carbon bloclgvhaving' anvv air gap betweensaid elements and 'said block, and conducting ele. ments respectively 'extending irom` said ser` rated :elementsto` one of each pair of' mountf3f l`A' device of the character described comprising `an insulating. base, provided with three parallelly arranged grooves, a pair of tubular fuse elements mounted side fb side u lon said lease` a air of niountinOr y D "Lio said;base-'within the. third grooveaforesaid A springs yfor each fuse element secured to said lease,v the two pairs ofvinounting springs being 'accommodated 'respectively in the outer grooves, aconducting plate mounted upon centrally of said fuse element, a carbon block secured to the top ofy said conducting plate, a pair ofserrated conducting elements mounted lupon said 'base on opposite sides lfc'said carbon block havingan ai-rgap beel tween said elements and said block, and conducting elements respectively extending three parallelly arranged grooves, a pair of tubular fuse elements mounted side by side upon lsaid base, a pair of mounting springs v for each fuse element secured to said base,

.the two pairs of mounting springs beingy accoinnfiodatedv respectively in the -outer grooves,` a "reversible conducting plate mounted upon said base within the third y groove aforesaid` centrally of said fuse element, a carbon block secured to the top of said conducting plate, a pair of serrated conducting elements mounted upon said base on opposite sides of said carbon block having an air gap betweensaid ,elements and said block, lland conducting elements respectively extending from said serrated elements to one of each pair of mounting springs, said conducting' 'plate being` longer than saidcarbon block, whereby it isa'dapted to-extend beyond' said carbon block in either one dip rection or the other. y p

5. A device ofthe character described comprising an iiisu'latingbase, a pairy of tubular fuse elements mounted `side by 4side upon said base, a pair of mounting springsl for each fuse element secured to said base, a

carbon block mounted upon said base cen-` trally of 'said fuseelements, 4a pair ofserf V rated conducting elements mounted. upon said base, and each located between the base, f

ments being arranged so thatl an air` gap exists between-them and 'said carbon block, and conducting elements respectively extending fronisaid serrated elements to one of each pair of mounting springs.

In witness whereof, we hereunto suh- Ascriloeoiir namesvthislst day of October,

Anl). 1913.

` VALLACE L. COOK.

GEURGE WV. RODORMER.

Witnesses: t

Hiizni. ANN Jonas, A. LLJONES, f 

